679141

Appears in sequences

• Number of two element anti-chains in Riordan trees on n edges (also called non-redundant trees, i.e., ordered trees where no vertex has out-degree equal to 1).at n=13A139263
• a(n) = N^(1/4) * log(N) / sqrt(log(log(N))) rounded to nearest integer, with N=10^n. Related to operation count of the deterministic factorization of an integer N using an improved Pollard-Strassen method.at n=17A309917